Field Signal · Curated Reading
The Engineering
Signal.
High-signal field notes, architecture teardowns, and engineering writing from 50 publications. A focused reading queue for becoming a stronger end-to-end engineer. Updated 21 Aug.
Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT
On February 13, 2026, alongside the previously announced retirement of GPT‑5 (Instant, Thinking, and Pro), we will retire GPT‑4o, GPT‑4.1, GPT‑4.1 mini, and OpenAI o4-mini from ChatGPT. In the API, there are no changes at this time.
Taisei Corporation shapes the next generation of talent with AI
Taisei Corporation’s HR team is leading the rollout of ChatGPT Enterprise to drive AI-powered talent development across the organization.
Introducing Daggr: Chain apps programmatically, inspect visually
Open the source for the full engineering note.
The next chapter for AI in the EU
OpenAI launches the EU Economic Blueprint 2.0 with new data, partnerships, and initiatives to accelerate AI adoption, skills, and growth across Europe.
EMEA Youth & Wellbeing Grant
Apply for the EMEA Youth & Wellbeing Grant, a €500,000 program funding NGOs and researchers advancing youth safety and wellbeing in the age of AI.
Keeping your data safe when an AI agent clicks a link
Learn how OpenAI protects user data when AI agents open links, preventing URL-based data exfiltration and prompt injection with built-in safeguards.
We Got Claude to Build CUDA Kernels and teach open models!
Open the source for the full engineering note.
Architectural Choices in China's Open-Source AI Ecosystem: Building Beyond DeepSeek
Open the source for the full engineering note.
Alyah ⭐️: Toward Robust Evaluation of Emirati Dialect Capabilities in Arabic LLMs
Open the source for the full engineering note.
PVH reimagines the future of fashion with OpenAI
PVH Corp., parent company of Calvin Klein and Tommy Hilfiger, is adopting ChatGPT Enterprise to bring AI into fashion design, supply chain, and consumer engagement.
Unlocking Agentic RL Training for GPT-OSS: A Practical Retrospective
Open the source for the full engineering note.
Introducing Prism
Prism is a free LaTeX-native workspace with GPT-5.2 built in, helping researchers write, collaborate, and reason in one place.
TRUSTBANK uses AI agents to personalize Furusato Nozei gifts
TRUSTBANK partnered with Recursive to build Choice AI using OpenAI models, enabling personalized conversational recommendations that simplify Furusato Nozei gift discovery.
How Indeed uses AI to help evolve the job search
Indeed’s CRO Maggie Hulce shares how AI is transforming job search, recruiting, and talent acquisition for employers and job seekers.
Categories of Inference-Time Scaling for Improved LLM Reasoning
And an Overview of Recent Inference-Scaling Papers
Unrolling the Codex agent loop
A technical deep dive into the Codex agent loop, explaining how Codex CLI orchestrates models, tools, prompts, and performance using the Responses API.
Scaling PostgreSQL to power 800 million ChatGPT users
An inside look at how OpenAI scaled PostgreSQL to millions of queries per second using replicas, caching, rate limiting, and workload isolation.
Inside GPT-5 for Work: How Businesses Use GPT-5
A data-driven report on how workers across industries use ChatGPT—covering adoption trends, top tasks, departmental patterns, and the future of AI at work.
Inside Praktika's conversational approach to language learning
How Praktika uses GPT-4.1 and GPT-5.2 to build adaptive AI tutors that personalize lessons, track progress, and help learners achieve real-world language fluency
How Higgsfield turns simple ideas into cinematic social videos
Discover how Higgsfield gives creators cinematic, social-first video output from simple inputs using OpenAI GPT-4.1, GPT-5, and Sora 2.
AssetOpsBench: Bridging the Gap Between AI Agent Benchmarks and Industrial Reality
Open the source for the full engineering note.
Introducing Edu for Countries
Edu for Countries is a new OpenAI initiative helping governments use AI to modernize education systems and build future-ready workforces.
How countries can end the capability overhang
Our latest report reveals stark differences in advanced AI adoption across countries and outlines new initiatives to help nations capture productivity gains from AI.
Horizon 1000: Advancing AI for primary healthcare
OpenAI and the Gates Foundation launch Horizon 1000, a $50M pilot advancing AI capabilities for healthcare in Africa. The initiative aims to reach 1,000 clinics by 2028.
Stargate Community
Stargate Community plans detail a community-first approach to AI infrastructure, using locally tailored plans shaped by community input, energy needs, and workforce priorities.